.m-t
  margin-top 20px
.m-r
  margin-right 20px

.p-horizal
  padding 0 20px
.p-vertial
  padding 20px 0

.fixed-br 
  position fixed
  bottom 20px
  right 20px
.text-center
  text-align center

.flex 
  display flex
  align-items center